Effect of the chemical constitution of the side-chain on the formation and the structure of mesophases in some polysiloxanes |
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| Institution: | 1. Department of Sustainable and Renewable Energy Engineering, University of Sharjah, 27272, Sharjah, United Arab Emirates;2. Sustainable Energy & Power Systems Research Centre, University of Sharjah, 27272, Sharjah, United Arab Emirates;3. Department of Electrical Engineering, GMR Institute of Technology, Andhra Pradesh, India;4. Center for Advanced Materials Research, University of Sharjah, 27272, Sharjah, United Arab Emirates;5. Chemical Engineering Department, Minia University, Elminia, Egypt;6. Department of Mechanical Engineering, Faculty of Engineering, South Valley University, Qena 83521, Egypt |
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| Abstract: | The synthesis and properties are described for a series of new liquid crystal side-chain polymethylsiloxanes with the same mesogenic rigid core but different substitutents or flexible spacers. The effect of the chemical structure of these polymers upon the polymorphism is studied by means of optical, DSC and X-ray experiments. By comparison with conventional mesogens, the partially bilayered structure of the smectic A phases (i.e. when the layer spacing is between once and twice the length of the side-chain) could be explained, taking into account the asymmetric character of the side-chains. |
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